mirror of
https://github.com/outbackdingo/patroni.git
synced 2026-08-25 14:53:37 +00:00
Alexander Kukushkin
e2faf641d5
Also governor is able to pick up already running master and slave instances without restarting them. In case is you have a lock and postgres is not running behaviour remains the same: it will start master in read only mode and then promote if it still has the lock.
61 lines
1.5 KiB
Python
Executable File
61 lines
1.5 KiB
Python
Executable File
#!/usr/bin/env python
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import atexit
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import logging
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import sys
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import time
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import yaml
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from helpers.etcd import Etcd
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from helpers.postgresql import Postgresql
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from helpers.ha import Ha
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logging.basicConfig(format='%(asctime)s %(levelname)s: %(message)s', level=logging.INFO)
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f = open(sys.argv[1], "r")
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config = yaml.load(f.read())
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f.close()
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etcd = Etcd(config["etcd"])
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postgresql = Postgresql(config["postgresql"])
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ha = Ha(postgresql, etcd)
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# stop postgresql on script exit
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def stop_postgresql():
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postgresql.stop()
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atexit.register(stop_postgresql)
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# wait for etcd to be available
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while not etcd.touch_member(postgresql.name, postgresql.connection_string):
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logging.info("waiting on etcd")
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time.sleep(5)
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# is data directory empty?
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if postgresql.data_directory_empty():
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# racing to initialize
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if etcd.race("/initialize", postgresql.name):
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postgresql.initialize()
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etcd.take_leader(postgresql.name)
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postgresql.start()
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postgresql.create_replication_user()
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else:
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synced_from_leader = False
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while not synced_from_leader:
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leader = etcd.current_leader()
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if not leader:
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time.sleep(5)
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continue
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if postgresql.sync_from_leader(leader):
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postgresql.write_recovery_conf(leader)
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postgresql.start()
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synced_from_leader = True
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else:
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time.sleep(5)
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while True:
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logging.info(ha.run_cycle())
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time.sleep(config["loop_wait"])
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